When the dyeing liquid containing sodium sulfate, alum, lime and iron salts, etc., must be added chelating agent.
当印染液中含有硫酸钠、明矾、石灰和铁盐等，必须加入螯合剂。
The removal of DOC and iron also increased with the increasing of the molecular weight and the concentration of organic matter during alum coagulation.
有机物的分子量越大，浓度越高，则溶解性铁和DOC的去除率越高。
The removal of DOC and iron also increased with the increasing of the molecular weight and the concentration of organic matter during alum coagulation.
有机物的分子量越大，浓度越高，则溶解性铁和DOC的去除率越高。
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